I don't think it's a matter of whether it ever occurred at a different time of year. What matters is the trend, and Amazon's current trend is a fall(ish) release.
Release dates are usually strategically planned in order to outsell the competition. Back in the early days, when the Kindle was brand new, Amazon didn't have any competition, so any release date would be successful.
But it makes sense that their release strategies would shift once the Kobo and Nook (and whatever others I'm forgetting) started gaining momentum. Hence the more recent fall releases. (we're referrring to e-ink Kindles, btw)
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